/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraEmitterViewModel.h
Gets a multicast delegate which is called when the emitter for this view model changes to a different emitter.
[FOnEmitterChanged](API\Plugins\NiagaraEditor\ViewModels\FNiagaraEmitterViewModel\FOnEmitterChanged) & OnEmitterChanged()